Precrop calculator

[snokvist]

Add a precrop calculator for a custom ratio (4:3 etcetera)
Will add examples tonight.

[mikecarr]

Still waiting on requirements :-)

[snokvist]

I started with a resolution picker
https://github.com/snokvist/sandbox/blob/main/tools/sensor_picker.py, but the sensor indexes keep changing.
I will update it with the latest during the weekend. Should be possible for chatgpt to convert to c#